Improvement in millstone-dressing machines



2 Sheets--Sheet 1.

J. G. GOOKSON & S. L. HART.

Millstone-Dressing Machine. No. 214,889. Pa tented April 29, I879.

IWVEJVTORJ WITWE' Is I wa W .ATTOJWEYS- N-PETERB, PMOTOUTHOGRAPHER.WASHINGTONv D C.

w 2 Sheets-Sheet 2. J. G. OOOKSON & S. L. HAR

Millstone-Dressing Machine. No. 214,889. Patented April 29,1879.-

N-FEIERS, PHDTO-LITHDGRAFNER, WASHKNGTDN, u c.

UNITED STATES PATENT OFFICE.

JOHN G. OOOKSON AND SAMUEL L. HART, OF MENASHA, WISGONSIN, ASSIGNORS TOSAID OOOKSON.

IMPROVEMENT IN MlLLSTONE-DRESSING MACHINES.

Specification forming part of Letters Patent No. 214,889, dated April29, 1879 application filed September 28, 1878.

To all whom it may concern:

Be it known that we, JOHN G. OooKsoN and SAMUEL L. HART, of Menasha, inthe county of Winnebago and State of Wisconsin, have invented a new andvaluable Improvement in Millstone-Dressing Machines and we do herebydeclare that the following is a full, clear, and exact description ofthe construction and operation of the same, reference being had to theannexed drawings, making a part of this specification, and to theletters and figures of reference marked thereon.

Figure l of the drawings is a representation of a top plan of ourmillstone-dressing machine. Fig. 2 is a side elevation of the same. Fig.3 is an end view, part sectional. Fig. 4 is a longitudinal sectionalview of the carriage, and Figs. 5, 6, 7, 8, 9, 10, 11, 12, 13,14, 15 aredetail views of the same.

Our invention relates to a machine for dressing millstones and the like,and the novelty of construction, adaptation, and arrangement will behereinafter set forth.

Our invention is designed as an improvement upon the. devices shown inPatents No. 185,125, of December 5, 1876, No. 191,938, of June 12, 1877,and others.

The great desideratum in this art is to obtain a true face on a stone;and to this end our invention consists, first, in resting themachine-frame on three feet or bearings placed in triangular position onthe frame, two or more of which are so constructed as to allow ofvertical adjustment at will. One of these adjustable feet is placed onthe forward end of the machine, and adapts the machine to verticallongitudinal adjustment, either on a true horizontal plane or at anydesired angle above or below the same. On each side of the rear end ofthe machine is secured a foot, one or both of which may be adjustable toafford ready facility for obtaining a true horizontal laterally, or anyangle or incline that may be desired.

The importance of this construction is obvious when it is understoodthat in dressing around the face of a stone the forward end, which restsupon the undressed portion, is upon a higher surface than the rear end,which rests upon the dressed portion, and great nicety of adjustment isrequired. The facility and correctness with which our device can beadjusted constitutes its advantage over the machines which rest upon thewhole surface of the frame, or those which have no adjustment.

In dressing around the face of a stone it is obvious that the foot whichprecedes rests upon a higher surface than the one which follows upon thedressed surface, and in such case to adjust for uneven surfaces the.foot which follows may be made adjustable and the other be fixed.

Qur machine is adapted to extend entirely across theface of the stone tobe dressed, the eye of the stone lying about the center of the machine,which, resting upon three points, each of which is near the periphery ofthe stone, affords a more extended and firmer bearing, and preventsoscillation of the bed-plate.

Our invention consists, second, in the construction of theadjusting-feet. In the lower surface of a horizontal block or bar weform a mortise or slot having an inclined bottom, which slot receives asliding wedge actuated longitudinally by a screw. This wedge is adaptedto rest upon the surface of the stone, and it serves to raise or lowerthe -bed-plate as the wedge is forced inward or outward by the screw.

A screw-rod passing upward through a slot in the foot-block receives athumb-nut, and said rod being rigid with the wedge the same may befirmly secured against displacement at any desired point of elevation byscrewing down the thumb-nut until it binds upon its bearings above theslot.

The diamond or tool working upon the surface of the stone exerts acontinuous upward force, and in dovetail or triangular bearings tends tobind the carriage in the wedge-shaped guideways.

To avoid this evil our invention consists, third, in constructing ourguideways with a true horizontal upper surface to correspond with asimilar bearing-surface on the flange of the carriage, thus avoiding anywedging or binding tendency from the upward pressure of the carriage.

To accomplish this We form the inner edge of the two parallel sides ofthe bed-frame at a bevel or incline, and secure by bolts or other wiseupon the top of each side a flat plate or strip, which extends over thebeveled portion, as shown. This construction of guideway also enablesthe operator to adjust the give more The fourth and fifth parts of ourinventionconsist in a tilting adjustable carriage-frame, by means ofwhich the drill or diamond may be inclined either tothe right or left,adapt ing it to dress the beveled furrows. Upon'the inner surface of thestandards of the main carriage we form two lugs, upon which restreversely-inclined surfaces upon each down wardly-extending side of thecarriage-frame. A perforated car upon'this carriage-frame re ceives athreaded rodon the transverse carriage-way, and a thumb nut serves toforce the carriage-frame either to the right or left, and the'inclines,acting upon the lugs, deflect the transverse carriage-way in eitherdirection, and consequently direct the tool or diamond at any angledesired. To adapt this tilting transverse carriage-way to the mechanismwhich operates the transverse carriage, and which will be hereinafterdescribed, we employ a loose connection, consisting of a nut, whichtraverses a horizontal transverse screwrod, and a link, loosely pivotedthereto, which link is also loosely pivoted to a lug on the transversecarriage. This loose connection allows the ready and important adjustahility of the tool-holder, as is obvious. By this con struction lobviate the necessity of employing an extra cross-head.

The staifingdevice constitutes the sixth part of our invention; and itconsists in a metal ring secured to the upper portion of the frame nearthe center, and perfectly true with the plane of the same in anydirection. A tramming-bar secures a straight arm to the ring, at theendof which arm is an adjustable paintblock adapted to sweep the face ofthe stone and indicate the condition of the surface.

The seventh part of our invention consists in an automatic deviceforimpelling the transverse carriage to the right or left. A disk,rigidwith a horizontal threaded transverse bar; is acted upon by aclutch, which, by means'of adouble spring and eccentric, can bemade-tooperate in either direction-that is to say, when the eccentric is turnedin one direction the clutch will gripe and turn with the diskin onedirection a certain distance with'eachtraverse of the main carriage; butonthereturn of the clutch it will ride uselessly along the surface ofthe disk, and, turning the eccentric in the opposite direction, willobtain a directly opposite result. A spring trigger, operating upon anadjustable studon the side of the bed-frame with each traverse of themain carriage, operates the clutch. It will thus be bserved that,afterthe clutch hasoperated t horizontal threaded bar in onedirectionuntil-thenutwhicho erates the transverse carriage hastraversed-the length of said bar, it is only necessary to change theeccentric to make the said nut move in the opposite direction. Bythrowing the clutch: out of actionthowever, the transverse carriagermaybe turned back by means of a crank on the end of the shaft.

The eighth part of our invention consists in a device for moving themachine around on the face of the stone. A lever is pivoted to thebed-frame near its forward portion, and to this lever is pivoted across-bar, slightly longer than the width of the frame, havingdownward-projecting ends, upon which are feet adapted to rest on theface of the stone. The length of the downward projections'is slightlygreater than the distance from the top'of the frame under the cross-bartothe surface of the stone: When the shoes rest upon the stonethe'leveroperates to both lift the frame and move'it totlieright orleft, as desired.

In dressing stones of smallerdiameter it is desirable that the traverseof the main carriage should not exceed the distanceof the surface to-bedressed.

To accommodate'ourdevice' to this condition of things, the ninth partofour invention consists in having two or more sunk bearings on the sideof the frame in'which to receive the slotted plate which carries thestud against which the-spring-trigger operates. A portion of thecapplate which forms the guideway for the main'carriag'e is in sections,and the fasteningswork in transverse-slots, allowing' the section'tobe-forcediuward, andconstitute a stop against Whiclithe main carriagewill abut at the end of the traverse.

Referring tothe-drawings, A represents the bed-frame, having opencenter,as shown, and provided with feet a a a; one-on each side of the body andone at the'forward end, two or more of which'may be'adjustable;

The lower surfaceof the adjustable feet is provided with a slot, c;Having an inclined bottom, a, adapted to receive awedge=shaped shoe, ahaving an ear, a which-receives and is operated by a screw-bolt, a,which works in the foot a. Rigidwith" and extending upwardfrom the shoeaisa threaded rod, a, which passes through'a slot in" the shoe andreceives athumh nutt a.

The inner upper edge of the bed frame A is beveled at b, andsecuredtotheupper surface of the parallel sides oftiie-frame are plates B B,extendingover'the'beveled'portion, the latter of which is madeinsections, the rear sections havingtransverse"slots'b'i To the forwardportion of the hed-frame'A is pivoted'alever, O, andto said'lever ispivoted' a' cross=b'ar, 0, having dowuwardlyextending projections, c,uponwhich'are formed feet or bearingsc;

Near themiddle ofthe fraine-upon its upper surface-is secured aring,'B,'true in' any direction with the plane of the bed, to which is looselyheld a straight arm, 01, by a tramming-bar, D. Upon the outer end of thearm d is adjustably secured by screws 01 a paintblock, (1

In the guideway formed by the parts B B b traverses the main carriage E,having flanges e to correspond with the guideway. E represents the backstandard of the main carriage, and E the front standard, and betweenthese standards is a transverse framing, F, having reverse inclines ffformed in its downwardlyprojecting sides, which reverse inclines restupon lugs e in each of the standards E E A perforated ear, f, upon theend of the frame F receives a threaded rod, g, upon the end of thetransverse carriage-way G, and this rod is acted upon by a nut, g, whichbeing turned in either direction tilts the transverse carriage,carriage-way, and framing to the right or left, as desired, inconsequence of the inclines f f acting upon the lugs e".

In the guideway of the carriage-way E operates the transverse carriageor tool-holder H, from a perforated lug, h, at one end of which ispivoted a link,'h, which is pivoted at its other end to a nut, H. Thisnut traverses a screw-threaded rod, I, journaled in the upper part ofthe standard E.

The tool-holder is constructed of an outer cylinder J, which is providednear its lower end, on the inside, with a guidepin, j, which sets into avertical groove on the outside of an internally-threaded tool-holder, JA vertical adjusting rod or shaft provided with a screwthreaded downwardextension (not shown), engages with the internally screw-threadedtoolholder, so as to adjust the same upward or downward, according tothe direction in which the hand-wheel J on the top of the rod is turned.The diamond is thus adjusted so as to cut deep or shallow, as desired.

This construction is not fully shown in the drawings of thisapplication, but forms a part of the patents hereinbefore cited.

To a bar, K, secured to the back side of the standard E is attached ahandle, k, and an arm, K, extending upward, carries a thumbscrew, 70,which operates upon a spring-brake, L. This brake acts upon theperiphery of a disk, M, which is rigid with the horizontalscrew-threaded rod I, and revolves with it in any direction.

A lever, N, is provided at its center with a slot, n, which receives theshaft of the rod I, and is provided at its upper portion with a slot, N,which receives the rim of the disk M, and at its lower portion with aspring-trigger, O. Pivoted to the upper end of thislever N is a lever,P, holding a double spring, R, which, being acted upon by adouble-acting eccentric, R, throws the lever N to the right or left,according to the direction in which the eccentric is turned. This.action of the lever N forces the portion of said lever which embracesthe rim of the disk M to act as a clutch. The spring-trigger O, strikingthe-stud S on the plate S, adjustably secured to the side of the frameA, as the 'main carriage F is traversed in either direction, serves, inconnection with the clutch, to turn the rod I a certain distance at eachtraverse.

Sunk bearings X on the side of the bedframe A allow the adjustable plateS to be moved nearer to the center of the machine in dressing smallstones, and in such cases the rear sections of the plates B, having theslots 1), are forced inward, and serve as a stop to the main carriage.

From the foregoing description the operation of our machine is obvious.

What we claim as new, and desire to secure by Letters Patent, is-

1. A stone-dressing machine provided with three feet or bearing pointsplaced triangularly, one on the forward end of the bed-frame and one oneach side near the back end, the former and one or both the latter beingadj ustable vertically, as and for the purpose set forth.

2. The foot-block at, having horizontal inclined slots a and verticalslot, combined with the wedge-shaped shoe a having screw,- rod a the nuta and the actuating-screw a as and for the purpose set forth.

' 3. The guideways for the operating carriage, formed by the bevel bupon the inner sides of the bed-frame, and the flat plates B B, securedupon the top thereof, substantially as and for the purpose specified.

4. The standards E E having lugs 6 in combination with thecarriage-frame F, having reverse inclines ff, the transversecarriage-way G, having screw-rod g, and the actuating nut g, asspecified.

5. The adj ustabletiltingtransverse carriage, as described, incombination with the link It, traversing nut H, and transverse rod I, asand for the purpose set forth.

6. The combination of the ring .D, rigid with the bed, with thetramming-bar D, the arm d, and adjustable paint-block d d, as and forthe purpose specified.

7. The combination of the disk M, lever N, clutch N, double spring Itand eccentric R, with the'spring-trigger O and stud S, as specified.

8. The combination of the pivoted lever (J, pivoted cross-bar 0, havingdownward projection c and shoes 0, with the frame of amillstone-dressing machine, as and for the purpose specified.

9. The bed-frame A, having two or more sunk bearings, X, in combinationwith the slotted plate S, having studs S, the sectional cap-plate B,having transverse slots, and the main carriage E,as and for the purposespecified.

In testimony that we claim the above we have hereunto subscribed ournames in the presence of two witnesses.

JOHN G. OOOKSON.

Witnesses: SAMUEL L. HART.

P. V. LAWSON, J r.,

